The federal Homeland Security Department, which oversees immigration detention, has called characterizations of inadequate conditions at the state-run Alligator Alcatraz “false.”

Earlier this month, a detention facility known as “Alligator Alcatraz,” which can house up to three thousand migrants, opened in the Florida Everglades.

"No protocols exist at this facility for providing standard means of confidential attorney-client communication, such as in-person attorney visitation and phone or video calls that are available at a...